Headlamp-adjustingchabt



July 1o, 192s.

T. W. F RECH HEADLAMP ADJUSTING CHART Filed Nov. 5, 1925 Tasas-:raar WZEhE'cH.

Hrs rz'aANzr.

Patented July 10, 1928.

f UNI/ren PATENT OFFICE.;

THEononn/.Wrrnncmbn CLEVELAND, omdmssmNon TMGENERAL i c COMPANY, ACORPORATION or imwyonx;

ELECTRIC H :aEanimarlAiJJIrsrrrrecrnilivrf A, l if i i i whether thelamps `arel properly focused."

The object` of `my inventionys to provide a devicewhich will be more'convenient to handle and operate than devices of that 4charactorheretofore available.

In the' accompanying drawing'Figl isV a front elevation partiallyinsection ofthe preferred form of my improved chart or screen; Fig. 2 isaside elevation partially in sectionshowing. more clearly the adjust!ing means therefor; Fig. 3 is a front elevation of a modification; andFig. 4 is a front elevation of still anothermodification.

Referring to the drawing, and particularly Figs. 1 and 2, a screen 10 issupported in a substantially vertical direction by means of a rod 11which carries at its up er end thereof the bracket 12 to which t e saidscreen is fastened. The 'rod 11 is slidably mounted in bearings 13 and14 carried by standard 15 which extends from a base 16. In order toinsure accurate alignment of the screen 10, I provide a pair of aligningrods 17 and 18 which extend downwardly therefrom and are slidable in theholders 19 and 2() respectively carried by the base 16. The screen maybe 'raised and lowered by means of a hand wheel 21 which operates thepinion 22 through the shaft 23, the pinion 22l meshing with rack 24constituting part of' rod 11. The scieen 10 has on its face a horizontalline 25 and a pair of vertical markers 26 and 27. The height of line 25is indicated by scales on the rods 17 and 18. The vertical markers aremovable and preferably consist of a pair of elastic tapes which may beheld by hooks or thumb tacks, their distances from the center line 28of' the screen being indicated by the scales 29.

The operation of my device is as follows: The automobile is firstproperly aligned with reference to the screen. One arrangement is toprovide guides for the wheels that will automatically center the car atright angles to the center of the screen, and to provide stops that willbring the headlights a prescribed distance, which may be twenty-fivefeet, from the screen. The alignment may be checked by sighting throughthe rear window of the car over the radiator cap to i applicati@ ineafnqmber the center mark 28 on the screen;` The next operation is tomeasure the distance from the floor' toi tvlefzenter offthe headlights,`and adjustftlie 'screenaccordingly until the 'line 254 isjthe prescribeddistance from the floor'. Measurefthe rdistance between." the headlightcentersfand set both "verticaltapes 26 andg27 onvthe correspondingI'g'urs along the1 scales 29` of the screen 10. With one headlightcovered, aim the beam ofthe' other on one of the points'of intersection30, and adjust thelheadlight so that its spot or pattern 3.1 iscentered, as indicated iny dotted linesfwith its u er boundary on". theliorizontalline 25. ext cover the adjusted. headlight and repeat theoperationen theother;

If when the car is empty, the beams are aimed to meet the requirements,loading th-e car fully will tilt the headlights upward into the eyes ofapproaching drivers. Therefore, an allowance must be made for the tiltof the headlights. The following table gives the necessary allowances asdetermined by tests of many hundreds of cars:

After the loading allowance has been determined, tlie screen is lowereda distance equal to the allowance, and this brings the line 25 thecorrect distance from the fioor.

In Fig. 3 a. modification is shown which comprises a. horizontally andvertically adjustable screen 32 supported by means of a rod 33 throughthe rollers 34 and straps 3b. The rod 33 is adjustably supported inslots 36 located in the uprights 37 and 38. Although vertical markers ofthe same character as .shown in Fig. 1 may be used, a simpler expedientis to provide a series of lines 39, pairs of which are spacedequidistant 'from the center line, the distance between lines of' therespective pairs varying according to the make of automobile. Thehorizontal line Ll() is similar to line 25 shown in Fig. 1.

Another modification is shown in Fig. 4 which comprises a removablescreen 41 supported yby means of the cross piece 42 and uprights 43-44.The cross piece 42 is supdition 'to being capable off" bem d-. V o .l L,la.. ported b'ymas lfof `fa rod 45; WhiChj-is {slid-` ably mounted lin*bearings rforined" in 'the' standard 46. Raising and lowering-of-thecross; :.pecge.; V412 faecomplishedoby; .means ofL the pinion 47 andrack 48:.1th110ughiheliandg; wheel 49. The horizontal marker 50 and thevertical markers 5152 .areprefrahlyf stationary. In thisinodifeationthere are no aligning rods, andfthenpright L13:"isV he Crosspiece 42. Carries Aan indi scaled. i

@ncar tio' ai@ other:

Y, l `1`deW1t-h: hedlightstobe adjusted.ithecrenmy lie; movedjalong'ajr'odeag'ffSuitable length from, 1in ,Figline screen fe"hfweits'pafticlzirscreen;7mm

Vhat claim as new and desire to secure fibyiLetters .Patent0itheiUntedtflieis im 11e-5:11.; -Af'.iheadlightdjusting apparatus com#prising a screen having thereon a horizontal Y \l-i11e-,ls'upp0rtirigmeans for said screen, means for vertically reciprocating:saids'en^'and""a soaleior'lindicating its height.

.24.Arheadlight adjusting apparatus com pisig' a1 zscreen having'horizontal and Svertie line`,` supporting rnean"ticallyreciprocatingsaid @dup df@ Y for( indicating lits'yheightl

